Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f91ab0cb2ded35…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 228bbcdf0150c355278dd457c5e04bed SHA-1: 627f0ea9754a6fcd2bba08c097f438899fbc07f8 SHA-256: e7f91ab0cb2ded3545fc8c1fdfefc7e50724c5b378e8b1922cbc842b18f832d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=this+is+us+season+5+episode+4+watch+online+free PDF link annotation
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7gdua6ji1837dpq2n7qn9soj50/49771055603.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafa431dbc---vefez.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/33169062122.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/1032376682.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/polutus.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/lilanigoxarenulepovelopof.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/sudipiw.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/fidavet.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ce96523---detutosaxeraz.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/binojotubasopefuw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/4ff52a555409f9f4e2c4d39bfe834349/lexatakunosabojerafefok.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/komijikuvobamedezaluwod.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/paxitapew.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/wolilujujebesijer.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/87854550365.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/50828489773.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/rimawazojekevoleritif.pdfIn PDF document text
    • https://superchills.com/userfiles/file/14919653388.pdfIn PDF document text
    • https://viettrungson.com/media/Files/27614323776.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83b5ab0bb61e9c15d69a89c9f3a3b0af/gavelabakezetija.pdfIn PDF document text
    • http://congluc.com/upload/files/10274819572.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bumab.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/79460705313.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/41956943967.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29fb17bfc---dosirebaxopezebefid.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fiferuzunis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 11076 bytes
SHA-256: a6f8c3206805925529aedc4eed0575d3979e075a2c3ed1f6fc6bb95a54267718
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16964 bytes
SHA-256: f9349e984340cea85ff6ad42905454efd17afcd7d4aa082dd650eb4319e59e14
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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